Journal
MATERIALS LETTERS
Volume 205, Issue -, Pages 75-78Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2017.06.067
Keywords
Sodium-ion battery; Cathode; ALD; NASICON-structure
Funding
- Youth Foundation of Tianjin Normal University [52XQ1404]
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Because of its sodium superionic conductor structure, Na3V2(PO4)(3) has been recognized as a promising candidate cathode material for room-temperature sodium-ion batteries. However, Na3V2(PO4)3 suffers from a severe capacity loss, especially at a high charge-discharge rate. To overcome this limitation, in this work Na3V2(PO4)(3) was coated with Al2O3 films (NVP@Al) using atomic layer deposition (ALD). The electrochemical performances of the NVP@Al nanocomposites as cathodes for sodium-ion batteries were investigated NVP@Al nanocomposite exhibited a relatively flat voltage plateau at 3.4 V in a nonaqueous sodium cell. When tested as a cathode in a voltage range of 2.5 V-4.0 V, NVP@Al exhibited initial charge and discharge capacities of 132 mAh/g and 107 mAh/g, respectively. The ALD-coated Na3V2(PO4)(3) electrodes exhibited significantly increased capacities, because of transformations of the as-deposited Al2O3 into a more Na+-conductive material. These preliminary results indicate that NVP@Al is a prospective cathode material for room-temperature sodium-ion batteries. (C) 2017 Elsevier B.V. All rights reserved.
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